In Wildfire 4 and CREO Elements or higher choose File -> Open and select STEP as type.

The parameter enable_absolute_accuracy in the config.pro needs to be set to yes if absolute accuracy is needed.

A recommended setting of the absolute accuracy is 0.01mm. If the part is not imported correctly, try again by changing the accuracy to 0.02mm and 0.05mm.

If the STEP file contains assembly data, see to it that it is imported as an assembly (otherwise, Pro/ENGINEER gives a warning).

Depending on the further usage, hybrid models and multi solids can be imported in part or assembly mode. Part mode allows import with user defined accuracies, in assembly mode all solids/surface can be individually handled.

Pro/ENGINEER / Creo Elements - System

Shaded view is helpful for a first impression of the model quality.

Highlighted menu option Info -> Geom/Check gives hints about geometric problems of the imported model in versions up to Wildfire 5. In Creo Parametric a similar functionality can be found in File -> Prepare -> ModelCheck Geometry Check